3D printing pen



FIG. 1 is a perspective view of a 3D printing pen, showing my newdesign.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a left view thereof.

FIG. 5 is a right view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

CLAIM The ornamental design for a 3D printing pen, as shown anddescribed.